Trolling plate



Jan. 25, 1949. Q PALM R 2,460,237

TROLLING PLATE Fi'led Aug. 15, 1947 IN V EN TOR.

ORR/N C. PALMER v HTTORNEVS Patented Jan. 25, 1949 UNITED STATES PATENT 1 OFFICE TROLLING PLATE Orrin C. Palmer, Melrose, Mass. Application A gust 15, 1947,'Serial No. 768,843

or else they are unbalanced if they are designed for ready application to and removal from propellers or propeler shafts.

Accordingly, the object of the present invention is to provide a balanced trolling plate and simple, practical means whereby the same may readily and easily be applied to and removed from a propeller shaft.

With the foregoing and other. objects i'n'view, which will become more fu ly apparent as the nature of the invention is better understood, the same consists in a trollin plate and mounting means therefor embodying the novel features of construction, combination and arrangement of parts as are illustrated by way of example in the accompanying drawings and as will be hereinafter more fully described and claimed.

In the drawings:

Fig. 1 is a rear view of my trolling attachment showing its re ation to the propeller.

Fig. 2 is a vertical section through the attachment shown in Fig. 1, and

Fig. 3 is-a view in perspective and partly sectioned of a modified form of hub and adaptor.

At 5, I have indicated a propeller mounted on the drive shaft 6 to rotate therewith and held thereon by the adaptor I which replaces the usual prope ler retaining cap nut. The adaptor I is threaded on a rearward extension 8 of the shaft 8 and is exteriorly threaded as at 9 between its nut establishing flange III and its rounded rear end I I. Transverse bores through the nut flange I ii enable the adaptor I'to be locked to the shaft 6 by means of a cotter pin.

The plate I2, the diameter of which is less than that of the propeller 5, is riveted, or otherwise rigidly secured, as at I 3 to the flange I4 of the huh I 5. The hub I5 has a threaded bore I6 which at its inner end I! is tapered. The hub I5 is threaded on the adaptor I whenever the trolling plate is to be used and both the threaded connection between the adaptor I and the shaft 6 and the threaded connection betweenthe hub I5 and the adaptor I are pitched so that the adaptor I and hub I5 are applied to the shaft extension 8 and "6 Claims. (01. 170-135) said adapter, respectively, by rotation in a di'-' rection opposite to the direction of rotation of the propeller 5. When the hub I5 is'threaded on the" adaptor I with the tapered end I! of the bore I'B in contact with the'rounded end II of said adaptor, a tight connection isestablished between said adapter and said hub. In this connection the hub I5 may, if desired, be formed to be screwed directly upon the shaft extension 8 so as to accomplish the propeller securing function of the adapter I, in which event any necessity of employing said adapter is avoided. If, however, the adapter I is'employed to fasten the propeller 5 on the'shaft 6 and if the plate, I2 is mounted on said adapter, the latter will constitute to all intents and purposes a part'of the shaft extension 8. Therefore, in the claims the expression rearward extension of a propeller shaft is to be construed as meaning either an integral part of the propeller shaft or an element such as the adapter I separate from said shaft and mounted thereon.

In accordance with my invention, I provide the plate I2 with equally spaced members I8 protruding rearwardly from its rear surface so that when the hub I5 is threaded on the adaptor I and the trolling plate is used, rotation of said plate with the propeller is resisted and thereby a. substantial torque is maintained on the threaded connections to maintain the latter tight. Preferably, the members I8 are of scoop-like or louver form and have their mouths 20 disposed forwardly as regards the direction of the propellers rotation so that an adequate torque on the threaded connections is ensured to maintain them tight. Preferably, too, the plate I2 is pro-' vided, in underlying relationship to the members I8, with openings I 9 through which water scooped by said members may flow. As shown, said plate may conveniently be provided with said members I8 and said openings I9 by pressing said members from said plate.

In Fig. 3, I have shown a modification of the threaded connection between the hub I5 and the adaptor I. The adaptor I has a set of spaced ridges 2| in parallel with its axis and the bore of the hub I5 has a like set of ridges 22. The ridges 22 are spaced and dimensioned so that each may enter between a pair of the ridges 2|. The ridges 2I and 22 are complementally threaded so that the hub I5 may be slipped onto the adaptor I substantially into its seated position and then be fully seated by a partial rotation of the hub I 5. This ensures maximum ease and convenience plate and projecting laterally therefrom to resist rotation of said plate so that in use saidzplate tends to become more tightly threaded upon said propeller shaft extension.

2. A trolling plate to be threaded uponareari-l upon said element in a direction opposite to the direction of rotation of the propeller, and scooplike elements carried by said plate and projecting laterally therefrom to resist rotation of said plate so that in use said plate tends to become more tightly threaded upon said element, said plate having openings therein through which water scooped by said scoop-like elements may flow.

5. In combination, a propeller shaft, a propeller mounted thereon. a troliing'platethreaded upon a rearward extension of' said shaft in a direction opposite to the direction of rotation of the propeller,.and scoop-like elements carried by said ward extension of a propeller shaft in a direction opposite to the direction of rotation of the-pro peller, and scoop-like elements carried by said plate and projectinglaterally therefrom to resist rotation, of said. plate so that in usesaid. plate tendsto becomemore tightly threaded'gupon said propeller-shaft extension, said: plate having openings thereinthrough which waterscoopedpby said scoop-like l elements, may flow.

3; A trolling plate attachment comprising, 'in combination, an exterior-1y threaded element, to be secured upona propeller shaft to fasten a propeller on saidshaft, a-trolling plate to be-threaded upon saidfilefnentina direction oppositeto the direction of; rotation. of thepropeller, and scooplike-telements: carried by saiditrolling; plate; and projecting laterally therefrom to. resist rotation ofxsaid; plate: so that inusesa-idplate tends to becomemore tightly threaded upon saidelement.

4. A trolling plate attachment comprising in combination, anv exteriorlythreaded element to be secured upon a propeller shaft to-fasten aipropelleron saidshaft, atrolling plate to be threaded plateand projecting laterally therefrom to resist rotation of said plate so that in use said plate tends to become more tightly threaded upon said shaftuextension.

6. In combination, a propeller shaft, a propeller mounted thereon, a trolling plate threaded upon a rearward extension ofisaid shaft in a direction opposite: mime-direction of rotation of the propeller, and scoop-like elements carried by said plate, and projecting laterally therefrom to resist rotationot said plate sothat in use said plate tends: to, becomemore-tightly threaded upon'said shaft extension, said plate having openings therein through which water scooped by said scooplike elements may; flow;

ORRIN C. PALMER.

REFERENCES CITED.

The following references are-of record in the file of this patent:

. STATES. PATENTS c Number Name Date 1,908,865 Richardson May 16, 1933 2,226,007 McGrete Dec. 24, 1940 2,265,625. Buck: Dec. 9, 1941 

